Buddy, I used to think the same thing. I told my therapist as much when he suggested I seek medication for my clinical ADHD. What he basically told me was that Psychiatrists are not stupid. They’ll listen to your story and they will evaluate whether or not you are a good candidate for meds. Substance abusers get weeded out fairly quickly, from what I have been told.

As long as you are honest with the doc, and willing to be open minded about treatment options, you’ll be fine.